Improvement in traps for street-sewers



T. DARK.

TRAPS FOP. STREET SEWERS.

'No.185 ,017.l VPatented Dec.5,1876.'

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THE GRAPHIC CD`N.`

N'r STATES PATENT OFFIGE.,

THOMAS DARK, OF BUFFALO, NEW YORK.

IMPROVEMENT IN TRAPS FOR STREETSEWERS.

Specification forming part of Letters Patent No. 185,0 I7, dated December 5, i876; application led January IZ, 1876.

To all whom it may concern Be it known that I, THOMAS DARK, of Bufv falo, in the county of Erie and State of New i sewer, as hereinafter specified.

In the drawings, Figure l is a sectional elevation 5 Fig. 2, a cross-section, showing the gate and fastening; and Fig. 3, a detail of the fastening.

A represents the receiver, and B the stenchtrap, all made of cast-iron. The back a of the receiver is made slanting, and the. back b of the bowl or trap B is constructed in a continnous slanting line with the back a., so as to get an unimpeded rush or fall ofthe water into the trap B. Formerly the basin B was made nearly round, but I now construct it with the delivery part b, (that nearest the mouth of the sewer) elongated, with only a gradual rise, as clearly shown in Fig. l. This, in practice, is found a great improvement over the old construction, as it will now iiush out with greater ease and certainty than by the old form, the rush of water lifting the sand, 85e., out and forcing it forward into the mouth ofthe sewer, and so on. The back a. and back b of trap B, formed in a continuous line, is also of great importance, as by it I get an unimpcded rush and a greater force to the water, which materially aids in flushing the trap, as before stated. n

The gate C is hung` on journals, and'dips into the water, which is always in the trap or basin B. ,This gate rests upon a ange, c,

bar, D, (see Figs. 2 and 3,) which is pivoted in the center to the gate, the ends catching into lugs cl d on the sides of the receiver, and

sliding on inclines c e on the gate, thus making a tight trap, and a fastening easily got at when it is desired to open the gate to clean out the sewer. y

In my former invention rods were used for fastening; but they were found to catch sticks, straw, Vand the debris of Athe streets.

The present fastening, above described, keeps the gate much tighter, eft'ectually preventing any escape of `gas.

The receiver is constructed so as to be selfcleansing, the back and front end being made at an angle, and that part of the basin which receives the water near the bottom of the door being contracted to equal the size ofa tifteeninch sewer.. The water,falling fourfeet from the level of the'street-gutter to the level of the Water in the basin, will force all the sand, Snc., out of the trap and wash it through the sewer.

l. The back a of thev receiver A, and back b of the trap B, constructed in a continuous line, and the exit end b ofthe trap elongated, as and for the purpose specified.

2. Ina stench-trap and receiver, the inclines e e' and lugs d d, in combination with the gate C and swinging bar D, as and for the purpose specified.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

THOMAS DARK.'

Witnesses: v

J. n. BRAKE, T. H. PARSONS. 

